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Most tachs have the same color whires, maybe some old stuff don't, but they all have the green (coil) white, (lights) red (12Volt) and lack (ground) wire set up.
I think there is a terminal on the fuse box that is only hot when you turn on the lights. If not, you could tap into a wire going to the heater face plate light, or just wire it up witht eh red wire and it'll light up as soon as you hit the key.
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